to their communities, they're bussed to the trinity river, south of the dallas skyline for a final group effort, to clear brush and create an overlook along a newly opened trail. eric greitens says what we see here is an example of how military training can work in civilian life. >> there's a tremendous set of skills and abilities which they bring back from their military service that they can now use here at home. they've all learned what it takes to work with a team and accomplish a mission. they're all used to being held accountable. they know what it takes to inspire people in difficult circumstances. they know that success doesn't come easy. so they bring back those skills and also those attitudes which they can apply in a civilian context. >> you take a bunch of veterans and you put them on an objective. it's gonna get done one way or another. >> robert brown was discharged from the marines in 2004. he was suffering from a traumatic brain injury and ptsd. >> i was an rp. i was a religious programs specialist. worked with the chaplain so i worked with suicide guys. we had several attempts.